The geologist who, in 1830, renewed the idea of uniformitarianism by showing gradual changes in some organisms that were found in successive fossil layers was
A. Georges-Louis Buffon.
B. Charles Darwin.
C. James Hutton.
D. Jean Lamarck.
E. Charles Lyell.
E. Charles Lyell.
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In figure "A", what is being injected into the
host cell?
a. enzymes b. the protein coat c. nucleic acids d. ribosomes e. more than one of these
Bones of trained athletes may be visibly thicker and heavier than those of nonathletes because
A) athletes have lower blood calcium levels than nonathletes. B) weight-bearing exercise increases bone mass and strength. C) nonathletes have a low parathyroid hormone rate. D) athletes produce more growth plates. E) nonathletes produce fewer osteoids.
Which of the following statements about fungi is true?
a. All are prokaryotic. b. All are multicellular. c. All require organic material for growth. d. All grow using sunlight and carbon dioxide. e. All are plants.
The structures labeled B in the accompanying figure _____.
A. prevents movement of materials between cells B. strengthens tissues by connecting to cell cytoskeletal elements C. allows the free passage of materials between cells D. is found mostly in stomach tissue E. is found in most tissues except heart muscle